Alexander - you're sorta forgetting one very important part of the equation, which is a developer's own retail policies. MSB won't be Audiobro's first product, it's not a leap in the dark for them, so we can reasonably expect them to broadly follow the kinds of policies that they've done before rather than jump to a whole new paradigm.
It's been very long discussed that you could sell a downloadable sample library for $50 and make a lot more sales than $5,000. Every developer has their own take on that, and what their policies on sales are - is there an intro discount, group buys, regular / irregular / zero sales. East West work very differently to Spectrasonics, but they both seem to do very well financially. I prefer the latter, but that's just me.
In short, its wishful thinking to suddenly expect Audiobro to totally change the way they do business. They are towards the upper-end price-wise, though hardly exorbitant. Of course they'll be aware of the current market, and all the other upcoming future products. There's no way that they will say "because X is a brass library and goes on sale for $200, we should sell MSB at that too". There really isn't another product like MSB out there now, nor as far as we know on the horizon. Its unique in a few important ways, its a behemoth and its been in development for a decade.
Factor it all in with their one comment on the subject - "While the price is still to be determined, we believe you will be pleasantly surprised by comparison to the other offerings on the market, especially considering the depth and scope of Modern Scoring Brass", and I think most of us arrive around the $1k mark. Could be 20% less if we're really lucky... somehow I doubt it will launch at over $1k as its a big psychological barrier and they'd know the ruckus it would create. I think what I ended up saying before is RRP $1,400 and intro sale of $899, still sounds about right.
Pointless guessing game done for me for the day!